Tic Tac Know Crossword Puzzle

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Across
  1. 3. Cause the plates to move; between the lithosphere and the asthenosphere
  2. 8. A rigid layer made up of the uppermost part of the mantle and the crust
  3. 11. A layer of molten iron and nickel
  4. 13. The process by which molten material adds new oceanic crust to the ocean floor
  5. 14. A deep canyon on the ocean floor
  6. 15. Theory that pieces of the Earth's lithosphere are in motion,driven by convection currents in the mantle
  7. 17. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
  8. 18. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
  9. 19. German Scientist who developed the Theory of the Continental Drift in 1912.
Down
  1. 1. A plate boundary where two plates move toward each other
  2. 2. A soft layer of the mantle on which the lithosphere floats
  3. 3. The layer of rock that forms the Earth's outer surface
  4. 4. A deep valley where two plates move apart
  5. 5. A break or crack in the Earth's lithosphere along which rocks move
  6. 6. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
  7. 7. Dense ball of solid material
  8. 9. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
  9. 10. the name of the single landmass that broke
  10. 12. A plate boundary where two plates move away from each other
  11. 16. A plate boundary where two plates grind against each other, moving it different directions